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14Louw1993.Pdf Onderstepoort Journal of Veterinary Research, 60:95-101 (1993) ·.. :•:· ·.· .... · ·... \ < .·· ·.........•.• ....... ·····•·· .··• > \········. i •.•.• ·.··•..•• ) •·•··••·· . ········ ••·. ...:·· .... ·....... ••.. ·. >·· . ••... ···. ·.... ·• !.. .. ·.... · •. ····••••·•···· ..· ......:··::::•:······ .. ... ·•··· ....... ....... .... < .... ··········· •:. ··•··.····... :··· ·. ... · ... :....• ·: . ...... .:•:: : ..... · ........... ·. .......... .·.::.:·:·:·:··· .. ... ABSTRACT LOUW, J.P., HORAK, I.G. & BRAACK, L.E.O. 1993. Fleas and lice on scrub hares (Lepus saxatilis) in South Africa. Onderstepoort Journal of Veterinary Research, 60:95-101 (1993) A total of 380 scrub hares (Lepus saxatilis) from 5 localities, ranging from the north-eastern Transvaal to the eastern and the south-western Cape Province of South Africa, were examined for fleas and lice. Ctenocephalides felis damarensis was almost exclusively responsible for the flea infestations on hares at 4 of the 5 sites. At 4 localities the prevalence and abundance of this flea reached peaks between August and October and declined thereafter to their lowest levels between February and April. Its pre­ valence and abundance in the north-eastern Transvaal were not correlated with the breeding cycle of the hares in this region. The 2 louse species recovered, sometimes sympatrically, were Haemodipsus lyriocephalus and Haemodipsus setoni. Listrophorus leporicolus was the only mite species recovered. INTRODUCTION tion maps for some species. The identity of the louse recovered from a scrub hare in South Africa Scrub hares (Lepus saxatilis) are widely distributed and described by Bedford (1934) as Haemodipsus in the Republic of South Africa and are particularly africanus has been disputed by other authors, who abundant in the eastern regions (Robinson 1982). state that the lice on these animals are either Hae­ In this country they are hosts of a number of flea modipsus ventricosus or Haemodipsus setoni (Led­ species (De Meillon, Davis & Hardy 1961; Haesel­ ger 1980). barth, Segerman & Zumpt 1966), lice (Ledger 1980) and ixodid ticks (Walker 1991). From 1983-1992, I.G. Horak regularly collected ectoparasites from scrub hares in various regions of The prevalence and seasonal abundance of various South Africa. The identity, monthly or bimonthly pre­ tick species on these hares in South Africa are well valence and abundance of their fleas and the iden­ documented (Horak, Sheppey, Knight & Beuthin tity and abundance of their lice are reported in this 1986; Rechav, Zeederberg & Zeller 1987; Horak & Fourie 1991) and the geographic distributions of paper. Similar data for their ticks have been pub­ lished separately (Horak et at. 1986; Horak, Fourie, several species have been plotted (Howell, Walker & Nevill 1978). There are no published data on the Novellie & Williams 1991; Horak & Fourie 1991). abundance of fleas on scrub hares in this country, but De Meillon et at. (1961) have provided distribu- MATERIALS AND METHODS Scrub hares sampled from 5 localities (Table 1) were processed for ectoparasite recovery as described by 1 Department of Parasitology, Faculty of Veterinary Science, University of Pretoria, Onderstepoort, 0110 South Africa Horak et a/. (1986) and Horak & Fourie (1991). 2 National Parks Board, Private Bag X402, Skukuza, 1350 South Fleas were mounted in lactophenol, left for a few Africa hours to clear and examined with a standard micro­ Received 16 February 1993- Editor scope. They were identified according to descriptions 95 Fleas and lice on scrub hares (Lepus saxatilis) in South Africa TABLE 1 The localities at which scrub hares were collected, the duration of the collection periods and the numbers of scrub hares examined in South Africa Number of hares Total Veld type Collection Collection Locality Coordinates collected number (Acocks 1988) period inteNals on each of hares occasion North-eastern Transvaal Shingwedzi 23°08'S, Mopani Veld June 1989- Bimonthly 3 18 31 °27'E Apr1990 Skukuza 24°58'S, Lowveld Aug 1988- Monthly· 5 240 31 °36'E July 1992 Eastern Cape Province Mountain Zebra 32°15'S, Karroid Merxmeullera Feb 1983- 1-4 months 2 26 National Park 25°27'E Mountain Veld Dec 1985 replaced by Karoo "Bucklands" a 33°05'8 , 26°40'E } Valley Bushveld Feb 1985- Monthly 4b 87 Andries Vosloo Kudu 33°08'S, Jan 1987 ReseNe a 26°40'E South-western Cape Province Bontebok National Park 34°02'S, Coastal Apr1983- Bimonthly 2b 11 20°25'E Renosterbosveld Feb 1984 a These properties share a common ± 11 km boundary b It was not possible to collect the required number of hares on each occasion by De Meillon et a/. (1961) and Haeselbarth et a/. Monthly mean maximum and minimum atmospheric (1966). Lice were placed on filter paper, allowed to temperatures and the total monthly rainfall were al­ dry and examined using a stereoscopic microscope so recorded at Skukuza. capable of 75 x magnification. The descriptions of Ferris (1932) were used to identify the lice. In order to confirm the identifications made under the stereo­ RESULTS scopic microscope, a single male and female of each species were examined under a scanning elec­ The numbers of fleas and lice recovered from the tron microscope. hares and the prevalence of infestation are summa­ rized in Table 2. The mean numbers of fleas recovered from the scrub hares were plotted to depict seasonal and Four species of fleas and 2 species of lice were re­ relative abundance, while the percentage of animals covered. Ctenocephalides felis damarensis was the infested on each occasion represents the prevalen­ most abundant find widely distributed flea, while ce of infestation. Haemodipsus lyriocephalus was the most abundant and H. setoni the most widely distributed louse. The numbers of scrub hares that were either preg­ nant or lactating were recorded during the survey at The seasonal abundances and prevalences of fleas Skukuza. On completion of the survey, the mean cu­ on the hares examined at Shingwedzi, Skukuza, mulative percentage of pregnant or lactating hares Mountain Zebra National Park, "Bucklands" combin­ was calculated for each calendar month and plotted ed with the Andries Vosloo Kudu Reserve, and the to represent the mean monthly reproductive status Bontebok National Park are graphically presented in of the animals. Fig. 1- 5 respectively. 96 J.P. LOUW, I.G. HORAK and L.E.O. BRAACK TABLE 2 The total number of fleas and lice recovered from scrub hares examined at various localities in South Africa No. of Ctenocephalides felis damarensis Echidnophaga spp. Haemodipsus spp. scrub Localities hares exam- E. galli- E. Ia- H. lyrio- d' ~ X Total H. setoni ined nacea rina cephalus Shingwedzi 18 241 307 0 548 (14) 0 0 0 0 Skukuza 240 575 839 140 1554 (183) 0 3 (3) 343 (8) 126 (23) Mountain Zebra Park 26 55 76 0 131 (18) 3 (3) 0 0 1 (1 ) Bucklands & Kudu Reserve 87 588 851 0 1439 (74) 166 (4) 0 0 0 Bontebok National Park 11 a -- - 36 (7) 1 (1) 0 0 41 (5) X number of fleas damaged and impossible to determine species or sex ( ) number of hares infested a 1 hare infested with Dinopsyllus sp. At Shingwedzi the largest number of fleas was re­ were the lowest. Echidnophaga gal/inacea, a flea of corded during August; at Skukuza this peak occur­ domestic fowls, was occasionally found, but signifi­ red during September 1988 & 1990 and during Oc­ cant numbers were recovered only once, namely in tober 1989 & 1991. No pattern of seasonal abun­ the Andries Vosloo Kudu Reserve in August 1986 dance was obvious for the fleas recovered in the (Fig. 4). The fairly large numbers present on this Mountain Zebra National Park, while peak burdens occasion suggest that the particular hares involved were recorded during October 1985 on "Bucklands" must have acquired the infestation near human ha­ combined with the Andries Vosloo Kudu Reserve, bitation. A few Echidnophaga Iarina, a common flea and August in the Bontebok National Park. of warthogs (Horak, Boomker, De Vas & Potgieter 1988), were present on 3 hares at Skukuza. A single The mean monthly percentage of hares at Skukuza specimen of a Dinopsyllus sp., a flea usually associ­ that were pregnant or lactating, or both, is graphi­ ated with rodents, was recovered from a hare in the cally illustrated in Fig. 6. Breeding appeared to take Bontebok National Park. These aberrant infestations place throughout the year with no clear indication of probably occurred as a result of intrusion or sharing a seasonal peak. of the habitat by the various hosts and is a common Atmospheric temperatures and total monthly rainfall phenomenon (Avetisyan & Ezekelyan 1975). In Ken­ at Skukuza are graphically presented in Fig. 7. ya Flux (1972) found that Lepus capensis was most commonly infested with Ctenocephalides felis stron­ The highest maximum temperatures were generally gylus and to a lesser extent by E. gallinacea. recorded during January and February. Most rain usually fell from November or December to January In South Africa C. felis damarensis has long been or February. recognized as the sole representative of this genus parasitizing scrub hares (De Me ilion et a/. 1961). The difference in the shape of the sternal plates of These authors, however, questioned the status of the 2 louse species as well as the presence of dis­ this flea as a subspecies of C. felis and felt that it tinct sclerotized paratergites protruding from the lat­ should be named C. damarensis, a species in its eral borders of abdominal segments 3-6 of H. seto­ own right. The present study confirms that C. felis ni, compared to mere sclerotized points in H. lyrio­ damarensis is a successful parasite of scrub hares cephalus, are evident from Fig. 8 & 9. and is established throughout the country. Listrophorus leporicolus was the only mite recover­ For its reproduction, Spilopsyl/us cuniculi, the Euro­ ed from the scrub hares in the present study. pean rabbit flea, is entirely dependent upon the ste­ roid hormones circulating in pregnant does (Mead­ DISCUSSION Briggs 1964). Rothschild & Ford (1972) found that Fleas the ovaries of female Cediopsyl/a simplex, a flea infesting rabbits and hares in North America, only A single species, C.
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